Rat control
Rat Exterminator in San Luis Obispo, CA
Need a rat exterminator in San Luis Obispo? Around here the culprit is almost always the roof rat — the climbing specialist raiding citrus trees and nesting in attics. We trap by species, then seal them out for good. California-compliant, no poison reliance.
- Inspection-first — we find every entry point
- Exclusion-first — sealed with steel, not poison
- Local — we know SLO's roof-rat pressure
Signs it's rats
Do You Need a Rat Exterminator in San Luis Obispo?
You need a rat exterminator in San Luis Obispo when the evidence points past mice: scratching in the attic at night, droppings bigger than a grain of rice near food, gnaw marks with clear tooth grooves, or citrus hollowed out on the tree. Rats cause more damage than mice — chewed wiring, shredded insulation, contaminated food — so waiting costs more than acting.
Attic scratching at night
The classic roof-rat sign. They favor attics, wall voids, and false ceilings — if the noise is overhead after dark, it's rats until proven otherwise.
Bigger droppings, bigger marks
Roof rat droppings run about 1/2 inch and spindle-shaped; Norway rat about 3/4 inch and capsule-shaped. Gnaw marks show distinct 1/6-inch tooth grooves — far coarser than mouse nibbles.
Citrus damage
SLO's signature clue: oranges with a small hole and the pulp eaten out, leaving a hollowed rind hanging on the tree. UC Master Gardeners of SLO County call this textbook roof rat damage.
Know your rat
Roof Rats vs. Norway Rats: Which One Is in Your Home?
The species decides everything — where traps go, where the nest is, and which entries to seal. Get it wrong and you trap the wrong places for weeks.
Roof rat (Rattus rattus)
Smaller and sleeker, with a tail longer than its head and body combined. An agile climber that nests aboveground — attics, wall voids, ivy, palm canopies, dense shrubs against the house. This is SLO's rat: the coastal California urban rat, active year-round. Traps go elevated — on ledges, beams, and rooflines.
Norway rat (Rattus norvegicus)
Larger and stockier (7–18 oz), a burrower that nests along foundations, under woodpiles and trash, and in gardens or fields. Indoors it sticks to basements and ground floors rather than attics. Traps go low, along walls and near burrows. Thinking you have mice? See our mice control page.
Local reality
Why SLO Is Roof Rat Country
"Rats love avocados and citrus" — that's UC Master Gardeners of SLO County, describing exactly what happens in local backyards every fall. Roof rats are expanding across California's Central Coast, and San Luis Obispo gives them everything they want.
Citrus, ivy, palms
Roof rats live in trees as happily as in attics. Citrus and avocado trees feed them; ivy slopes, bougainvillea, and palm canopies house them; overhanging limbs become elevated highways straight to your roofline.
Old homes, new gaps
Downtown's century-old homes have aged fascia gaps at the roofline, original unsealed vents, and raised crawl spaces — a roof rat's dream layout. Even 1970s tracts have tile-roof gaps that rats travel like roads.
Year-round pressure
Roof rats stay active all year in California. The surge SLO homeowners notice from October through January — first rains, cooling nights, ripening fruit — is movement, not new breeding. Late summer and fall is when citrus damage and attic activity peak.
What to do about the yard: prune tree limbs at least 3 feet from the roof (6 feet is better), keep a 2-foot gap between shrubs and the building, remove climbing vines near the house, pick up fallen fruit, and keep garbage lids tight. Habitat work is half the job — a trimmed yard is a less inviting one.
How we do it
How We Remove Rats — Then Keep Them Out
Rats are neophobic — they avoid new traps and baits for days or even weeks, and roof rats are the worst of all. So we pre-bait before we set, place by species, and finish with exclusion.
-
Inspect & ID
Species confirmation from droppings, marks, and rub marks — smudges on beams and pipes that mark active runways. Roof rat or Norway rat decides the entire plan.
-
Trap by species
Roof-rat traps go off the ground — ledges, shelves, beams, fence tops — spaced 10–20 feet apart, a dozen or more for heavy infestations. Norway-rat traps go along walls and dark corners near burrows. Baited-but-unset first, until bait is taken reliably.
-
Exclude
Every opening over 1/2 inch for rats (1/4 inch keeps mice out too) sealed with galvanized mesh, steel wool, and sheet metal — never foam or caulk alone. UC IPM calls exclusion the most successful, longest-lasting rat strategy there is. See exclusion details.
-
Reduce the habitat
Sanitation and harborage work around the property — the attractants removed, the climbing routes cut — so the next rat wave finds nothing worth staying for.
Good to know
Rat Control Questions, Answered
Roof rats are smaller and sleeker, with a tail longer than their head and body combined — agile climbers that nest aboveground in attics, wall voids, trees, and ivy. Norway rats are larger, stockier burrowers that nest along foundations, under woodpiles and trash, and stick to basements and ground floors indoors.
Scratching in the attic at night is the classic roof-rat sign — they favor attics, wall voids, false ceilings, and cabinets. Other signs: droppings near food, 1/6-inch gnaw marks, burrows along foundations, rub marks on beams, and rats running along utility lines or fence tops at dusk.
Roof rats. UC Master Gardeners of SLO County call it textbook damage: oranges with a small hole and the pulp eaten out, leaving a hollowed rind hanging on the tree — or lemons with the rind eaten off entirely. Rats love avocados and citrus.
Usually, yes. Locals say "field rats," but the animal raiding citrus trees and nesting in attics around San Luis Obispo is the roof rat (Rattus rattus) — a climbing species. Knowing the species matters because it changes where traps go.
Plan on several weeks, not a single visit — rats are cautious around new traps and baits, so pre-baiting is part of the job. Most homes are rat-free after two to four follow-ups, then exclusion keeps them out for good.
We don't rely on broadcast poison at all. Our approach is inspection, trapping, and exclusion — California-compliant IPM. Poisoned rats also die inside walls, creating odor and sanitation problems that trapping avoids.
Hearing Them Tonight? Let's End It.
Roof rats don't leave on their own — but the right traps in the right places, plus sealed entries, ends it for good. Call now.
[Phone]